我是Docker的新手，正在尝试使用GitHub操作执行CI。
这是我在GitHub上的.yml文件。

name: CI to Docker Hub
on:
 push:
   branches: [main]
 pull_request:
   branches: [main]

jobs:
 build:

  runs-on: ubuntu-latest

   steps:
  - name: Check Out Repo
    uses: actions/checkout@v2

  - name: Login to Docker Hub
    uses: docker/login-action@v1
    with:
      username: ${{ secrets.DOCKER_HUB_USERNAME }}
      password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}

  - name: Set up Docker Buildx
    id: buildx
    uses: docker/setup-buildx-action@v1

  - name: Build and push
    id: docker_build
    uses: docker/build-push-action@v2
    with:
      context: .
      file: ./Dockerfile
      push: true
      tags: your-order-backend:latest

  - name: Image digest
    run: echo ${{ steps.docker_build.outputs.digest }}

我在我的Github中也添加了Docker Hub的Secrets。我不知道为什么，但是它在> exporting to image:时失败了